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I can understand you being upset you won't be able to spend your birthday morning with her and wake up to her on your birthday but you will have the rest of the day right? What you should do is tell her that it bothers you that you can not be with her at your parent's house the eve of your birthday but also try to understand that she has to work that morning that is an unforeseen occurrence that she can't get out of. Make the best of the time that you do have together and don't make it a strained day with hurt feelings maybe some time alone with your parents will do some good. This is one of those time that you have to compromise and just be glad that you will get any kind of time with her on your birthday but ask her to take the day off next year for your birthday with no exceptions. Don't let this put a strain on your relationship sometimes things come up that are out of our control and we have to make the best of it.